Maternal cotinine (ng/ml) | Number of children | Total difficulties | Hyperactivity/inattention | Conduct problems | |
---|---|---|---|---|---|
OR (95% CI) | |||||
All | ≦ 0.21 (non) | 1882 | Reference | Reference | Reference |
0.22–0.51 (low passive) | 531 | 1.11 (0.83, 1.49) | 1.23 (0.89, 1.69) | 1.07 (0.81, 1.43) | |
0.52–11.48 (high passive) | 535 | 1.25 (0.93, 1.68) | 1.15 (0.82, 1.60) | 1.30 (0.98, 1.72) | |
11.49 ≧ (active) | 268 | 1.67 (1.17, 2.39)* | 1.49 (1.00, 2.23)+ | 1.07 (0.74, 1.56) | |
P for trend | 0.004 | 0.051 | 0.208 | ||
Boys | ≦ 0.21 (non) | 929 | Reference | Reference | Reference |
0.22–0.51 (low passive) | 276 | 1.36 (0.93, 1.98) | 1.45 (0.97, 2.16)+ | 1.18 (0.80, 1.74) | |
0.52–11.48 (high passive) | 269 | 1.28 (0.86, 1.90) | 1.43 (0.95, 2.17)+ | 1.45 (0.99, 2.14) | |
11.49 ≧ (active) | 140 | 1.94 (1.22, 3.07)* | 1.59 (0.97, 2.63)+ | 1.19 (0.73, 1.95) | |
P for trend | 0.007 | 0.024 | 0.126 | ||
Girls | ≦ 0.21 (non) | 953 | Reference | Reference | Reference |
0.22-0.51 (low passive) | 255 | 0.82 (0.51, 1.34) | 0.90 (0.51, 1.59) | 0.95 (0.62, 1.47) | |
0.52-11.48 (high passive) | 266 | 1.23 (0.79, 1.92) | 0.77 (0.42, 1.40) | 1.15 (0.76, 1.76) | |
11.49 ≧ (active) | 121 | 1.36 (0.77, 2.42) | 1.36 (0.69, 2.65) | 0.94 (0.52, 1.67) | |
P for trend | 0.205 | 0.858 | 0.844 |